Effect of Alford force and ball bearing on dynamic characteristics of rotor system
CHENG Mei1,2; MENG Guang1; WU Bing-yu2
1.The State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, China;
2.Shanghai Baosteel Equipment Maintenance Co.,Ltd, Shanghai 201900, China
Abstract：Under the conditions that both the nonlinear ball bearing force and Alford force, the dynamic model of the rotor system was set up. Then nonlinear dynamic properties of rotor-ball bearing with Alford force were studied by means of numerical stimulation. The nominal contact angle of the ball bearing was introduced in the improved ball bearing method. And the result of the present method was in good agreement with the previous conclusions, so it was feasible using this method to predict the dynamic characteristics of rotor system. By using the numerical value integral method, the influences of a series of factors on the nonlinear dynamic behaviors of the coupled system were studied.By changing the values of the rotation speeds, the ball bearing clearance and the rotor eccentricity, the bifurcation diagram was obtained respectively. Meanwhile the pictures of some typical Poincare maps and frequency spectra were also given. From the results of the numerical simulation, it is found that the stability of the coupled rotor system could be improved under combined Alford force and ball bearing.
2011, Vol. 30 
